Malicious PDF — malware analysis report

Static analysis result for SHA-256 7d156e7f7285ee2e…

MALICIOUS

PDF

71.0 KB Created: 2021-04-10 21:42:54 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-08-20
MD5: 3b09930ad69391c46fd7677370bd5b88 SHA-1: b09b71b69e7385e0a07d3969d832b74c8714eb27 SHA-256: 7d156e7f7285ee2ee37b3193ce3a6c68d56a77da8bfade6380827e6b72487135
186 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1059.007 JavaScript

This PDF document contains a large number of external links, identified as a link farm, with one URL pointing to 'resalured.ru'. The presence of a link farm and the ML classifier's high confidence score indicate a malicious intent, likely for phishing or ad-fraud. No scripts were extracted, but the PDF structure itself facilitates the malicious activity.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9997

Heuristics 6

  • ClamAV: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0
  • Small PDF contains mass external PDF link farm critical PDF_SEO_LINK_FARM
    Small PDF contains many clickable external PDF links, mostly clustered on one host. This matches generated SEO/link-farm PDF carriers used to route users into malicious or unwanted-software delivery chains, rather than a normal document citation pattern.
  • Small PDF is a non-clustered link farm on disposable hosting medium PDF_SEO_DISPOSABLE_LINK_FARM
    Small PDF contains many clickable external PDF links spread thin across many distinct hosts (no single dominant host), corroborated by a utm_term SEO-redirector link and/or links parked on free/disposable content hosts. This is the 'free document/template' SEO phishing PDF family, which ranks for search queries and routes users into payload/redirect chains, rather than a normal document citation pattern. The PDF itself carries no exploit — the risk is the linked destinations.
  • External URI info PDF_URI
    PDF contains an external URL action
  • Object number defined twice with different bodies info PDF_DUPLICATE_OBJ_BODY_INCREMENTAL
    The same indirect object (N G) is defined more than once with different body bytes. First-wins and last-wins readers will resolve different content, which is a parser-confusion shape used by targeted PDFs. Body-only differences are common in benign incremental updates, so severity is raised only when the duplicate carries active content.
  • Embedded URL info EMBEDDED_URL
    One or more URLs were extracted from the document. The URL itself is not a detection — see the per-URL labels for which channel (macro, JS, link annotation, document body, ...) reached each URL.
    URL https://resalured.ru/strik?utm_term=hotpoint+gas+stove+knobs PDF link annotation
    • https://cdn.sqhk.co/juzurupivepo/fPieFfu/sport_cars_vs_police.pdfIn PDF document text
    • https://cdn.sqhk.co/soziwariru/1gjghWD/lynx_point_siamese_personality_traits.pdfIn PDF document text
    • https://cdn.sqhk.co/rifojimuna/erHGqa2/69914326391.pdfIn PDF document text
    • https://cdn.sqhk.co/jekunesoru/ifjejhI/surok.pdfIn PDF document text
    • http://sovumeriwox.mygamesonline.org/roland_berger_automotive_report.pdfIn PDF document text
    • http://ragaliteres.iblogger.org/demonstrative_speech_outline_template.pdfIn PDF document text
    • https://cdn.sqhk.co/kajutizikodu/hdS2jhn/95735492402.pdfIn PDF document text
    • https://cdn.sqhk.co/tiwumixe/icLwhgq/kawaboxopoxokuxefoga.pdfIn PDF document text
    • http://vivuvulefova.iblogger.org/reality_tv_show_treatment_example.pdfIn PDF document text
    • https://cdn.sqhk.co/sisuriwul/ibhhjhp/buxabugazor.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://dowinoxerirud.epizy.com/94192692801.pdfIn PDF document text
    • https://2e81f42f-67f9-46a9-89e2-a5f3ab3b03ee.filesusr.com/ugd/f138f5_11507beba129472bbc63284c00df44c9.pdf?index=trueIn PDF document text
    • https://0296ecfc-28ae-4fa5-925c-67a25994cace.filesusr.com/ugd/c88839_d5a72c469a3a429295109d4894b14b8a.pdf?index=trueIn PDF document text
    • https://944bcc21-9f45-42c2-9889-8cf837fa5d1c.filesusr.com/ugd/50f869_220cf0611bc84c74bcc6f3aad3684804.pdf?index=trueIn PDF document text
    • http://relivoziz.atwebpages.com/diesel_electronic_fuel_injection_system.pdfIn PDF document text
    • https://98cdd5c5-c43e-49eb-9373-39517e896cbb.filesusr.com/ugd/90661f_fbd8a35965cc4484ae038869dd288b4b.pdf?index=trueIn PDF document text
    • http://dinedasuzo.rf.gd/kobulotelifozepuxiv.pdfIn PDF document text
    • http://telifujovemevo.atwebpages.com/34593479533.pdfIn PDF document text
    • https://e082b6be-64c0-45f6-a8ff-82b9c6f476f0.filesusr.com/ugd/1479de_3b4b2518a348450db636add2264883b7.pdf?index=trueIn PDF document text
    • https://79c9c32e-6572-42fd-9c0e-61d057d48a34.filesusr.com/ugd/33a1c8_d305454d87bb4cbba75868023b819d5f.pdf?index=trueIn PDF document text
    • http://satawakerexe.atwebpages.com/xodivaxefo.pdfIn PDF document text
    • http://www.w3.org/1999/02/22-rdf-syntax-ns#In PDF document text
    • http://purl.org/dc/elements/1.1/In PDF document text
    • http://ns.adobe.com/pdf/1.3/In PDF document text
    • http://ns.adobe.com/xap/1.0/In PDF document text
    • http://ns.adobe.com/xap/1.0/mm/In PDF document text
    • http://ns.adobe.com/xap/1.0/rights/In PDF document text
    • http://scripts.sil.org/OFLIn PDF document text

Extracted artifacts 2

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000d96c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD96C 5084 bytes
SHA-256: 6ae3659d52b10694cc70df49b280db6e8a5a507a1cd63db703543a86d96b29d1
font_01_sfnt_off0000ead8.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEAD8 10616 bytes
SHA-256: 2de1f2ced1634d61a95eb7ab9a24d96f6dea6df13482c416b416a94438e79674

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